I loved this film when I was a kid. With Raquel Welch, Stephen Boyd and the evil Donald Pleasence.
Was a TV series in 1968 briefly. Also, being remade for release in 2010!
Plot: A diplomat is nearly assassinated. In order to save him, a submarine is shrunken to microscopic size and injected into his blood stream with a small crew. Problems arise almost as soon as they enter the bloodstream.
[youtube=425,350]http://www.youtube.com/watch?v=3o8vsU0Dw-4[/youtube]
IMDb trivia: When filming the scene where the other crew members remove attacking antibodies from Ms. Peterson for the first time, director Fleischer allowed the actors to grab what they pleased. Gentlemen all, they specifically avoided removing them from Raquel Welch's breasts, with an end result that the director described as a "Las Vegas showgirl" effect. Fleischer pointed this out to the cast members -- and on the second try, the actors all reached for her breasts. Finally the director realized that he would have to choreograph who removed what from where, and the result is seen in the final cut.